Thank you for your feedback!
I'll make sure to properly fill out the README with gameplay instructions, features (including sound info), and how to play, so it's clearer for future players. I’ll also add a proper open source LICENSE file to meet the criteria.
Regarding the sound, it should be working — I’ll double-check the implementation and volume settings to ensure it's not being muted or misconfigured.
As for the gameplay balance: that’s a great point! The current mechanics do maintain a steady state if you only upgrade when affordable. I plan to tweak the progression and add more dynamic challenges or escalation to make the experience more engaging over time.
Thanks again for playing and for the helpful notes!